Effect of plasma on efficiency enhancement in a high power relativistic backward wave oscillator

Sawhney, Ravinder Singh; Maheshwari, K. P.; Choyal, Y.

doi:10.1109/27.256780

Cited by 31 publications

(6 citation statements)

References 6 publications

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“…With the aid of the Maxwell and fluid equations the wave equations in regions I and II are given by Region I ðr 2 ? þ v 2 AE;I;bp ÞdÊ z ¼ 0 ð1Þ…”

Section: The Model Descriptionmentioning

confidence: 99%

“…The relativistic traveling-wave tube (TWT) is an important high-power source of broad-band high-power microwave generation at centimeter wavelengths, developed over the last several decades [1][2][3][4][5]. One of the common features of a TWT is a slow-wave structure (SWS) such as a dielectric material, disk-loaded waveguide, or a helix [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Plasma effect in tape helix traveling-wave tube

Saviz

Salehizadeh

2014

J Theor Appl Phys

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A linearized relativistic field theory of a plasma-loaded helix traveling-wave tube is presented for a configuration where a solid electron beam propagate through a sheath helix enclosed within a loss-free wall in which the gap between the helix and the outer wall is filled with a dielectric. Numerical study of the effect of plasma density on the phase velocity and growth rate has been done. Numerical results show that the plasma have different behaviors in different density limits.

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“…With the aid of the Maxwell and fluid equations the wave equations in regions I and II are given by Region I ðr 2 ? þ v 2 AE;I;bp ÞdÊ z ¼ 0 ð1Þ…”

Section: The Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasma effect in tape helix traveling-wave tube

Saviz

Salehizadeh

2014

J Theor Appl Phys

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“…where a l,m (1) , a l,m (2) , b l,m (1) , b l,m (2) c l,m (1) , c l,m (2) , d l,m (1) and d l,m (2) are as follows:…”

Section: Perturbed Transfer Fieldsmentioning

confidence: 99%

“…In recent years, there has been increasing interest in high-power and high-frequency microwave devices for generating radiation at millimeter and sub-millimeter wavelengths. The relativistic traveling-wave tube (TWT) is an important high-power microwave apparatus, developed over the last several decades [1][2][3][4][5]. One of the common features of a TWT is a slow-wave structure (SWS) such as a dielectric material, disk-loaded waveguide, or a helix [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The schematic illustrations of boundaries shown in Fig. 1 include three regions: (1) inside the beam that includes the electron beam and plasma (2) between the beam and helix that includes plasma (3) between the helix and the wall, which is a vacuum. We are investigating these effects on the four modes: (1) The coupling of the beam-plasma extraordinary mode and the plasma extraordinary mode in regions I and II, respectively (X bp -X p ), (2) the coupling of the beam-plasma ordinary mode and plasma ordinary mode in regions I and II, respectively (O bp -O p ), (3) The coupling of the beamplasma extraordinary mode and plasma ordinary mode in region I, II, respectively (X bp -O p ), (4) The coupling of the beam-plasma ordinary mode and plasma extraordinary mode in region I and II, respectively (O bp -X p ).…”

Section: Introductionmentioning

confidence: 99%

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The effect of beam and plasma parameters on the four modes of plasma-loaded traveling-wave tube with tape helix

Saviz

2014

J Theor Appl Phys

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Field theory is applied to analyze the behavior of the electromagnetic wave in the presence of a solid electron beam and magnetized plasma-loaded tape helix travelingwave tube. The obtained dispersion relation implicitly includes azimuthal variations and all spatial harmonics of the tape helix. Results indicate that the frequency and the phase velocity of (X bp-X p) and (O bp-X p) modes increase with cyclotron frequency and for (O bp-O p) and (X bp-O p) modes decrease. In the strong magnetic field limit, the maximum growth rate and frequency of all modes are constant at different values of cyclotron frequency and beam energy. If the plasma density increases, the frequency and phase velocity of four modes will increase. The maximum growth rates of the four modes in the lower plasma density are equal and for higher values of plasma density the (O bp-X p) mode has greatest value. The phase velocity and the frequency of (X bp-X p) with (X bp-O p) modes and (O bp-O p) with (O bp-X p) modes are coinciding with each other and for first case increase with beam density, but for latter decrease. The maximum growth rate of (O bp-O p) mode and the maximum frequency of (X bp-X p) mode have highest values as a function of the electron beam density.

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